Table 9: Recommended Sta Path Cost Range; Table 10: Recommended Sta Path Costs; Table 11: Default Sta Path Costs - SMC Networks SMCGS10C-SMART Management Manual

| Configuring the Switch
C 4
HAPTER
Configuring the Spanning Tree Algorithm
changes, thereby combining remote network segments into a single
spanning tree. As implemented on this switch, BPDU transparency
allows a port which is not participating in the spanning tree (such as an
uplink port to the service provider's network) to forward BPDU packets
to other ports instead of discarding these packets or attempting to
process them.
Path Cost – This parameter is used by the STA to determine the best
◆
path between devices. Therefore, lower values should be assigned to
ports attached to faster media, and higher values assigned to ports
with slower media. (Path cost takes precedence over port priority.)
By default, the system automatically detects the speed and duplex
mode used on each port, and configures the path cost according to the
values shown below.

Table 9: Recommended STA Path Cost Range

Port Type
Ethernet
Fast Ethernet
Gigabit Ethernet

Table 10: Recommended STA Path Costs

Port Type Link Type
Ethernet Half Duplex
Full Duplex
Trunk
Fast Ethernet Half Duplex
Full Duplex
Trunk
Gigabit Ethernet Full Duplex
Trunk

Table 11: Default STA Path Costs

Port Type
Ethernet
Fast Ethernet
Gigabit Ethernet
Priority – Defines the priority used for this port in the Spanning Tree
◆
Algorithm. If the path cost for all ports on a switch are the same, the
port with the highest priority (i.e., lowest value) will be configured as
an active link in the Spanning Tree. This makes a port with higher
priority less likely to be blocked if the Spanning Tree Algorithm is
– 126 –
IEEE 802.1D-1998
50-600
10-60
3-10
IEEE 802.1D-1998
100
95
90
19
18
15
4
3
Link Type
Half Duplex
Full Duplex
Trunk
Half Duplex
Full Duplex
Trunk
Full Duplex
Trunk
IEEE 802.1w-2001
200,000-20,000,000
20,000-2,000,000
2,000-200,000
IEEE 802.1w-2001
2,000,000
1,999,999
1,000,000
200,000
100,000
50,000
10,000
5,000
IEEE 802.1w-2001
2,000,000
1,000,000
500,000
200,000
100,000
50,000
10,000
5,000